Can anyone suggest where in an assembly process I am likely to find
Boron and Arsenic?  

I've been presented with an assembly that has some "black crud" on and
around some reflowed SM solder joints.  Analysis came back with not only
the "usual suspects" but also these 2 elements.  While I am not
eliminating it, for various other reasons I am discounting the
likelihood of the solder paste being the source. 

Thanks in advance for your thoughts. 

Rich K
  

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